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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.你以为恐龙灭绝了吗？你以为水怪都是传说吗？你以为被奥特曼击败的都是电影特技吗？大千世界，无奇不有！真正的怪兽在这里等着你！Some people will think that people with type B blood are very mysterious. They usually live in seclusion and see the head but not the tail. When they want to talk to him, they can't find anyone. When they don't look for him, they will suddenly appear again. Now there are some girls who just like this unique temperament, which will attract girls to be more interested in them and want to know more about them.曹国舅成仙后，凡间竟有一股由他引起的怨气袭上天庭，曹国舅为清白下凡平怨，却发现怨气乃亲弟曹景植所化的阴尸魔王引起。两厢对抗，曹国舅为弟牺牲自己，魔王大彻大悟，曹国舅也重生位列八仙。俊风啊，《喋血杀马镇》的电视剧可能要耽搁了。英布开门见山，现在可不想和随何这样绕圈子浪费时间。In other words, experienced climbers have formed a psychological representation of the handle, which makes them know which kind of handle they see and which kind of grip method they need to use without conscious thinking. In addition, the researchers also found that when experienced climbers see a specific handle, their brains will send a signal to their hands to prepare them to grasp it accordingly without conscious thinking.